Talk:List of chemical elements

Hydrogen peroxide

Regarding the density of plutonium. Allotropes_of_plutonium says 19.86 for alpha phase, but there are six phases. Phases can be stabilized by alloying with a small amount of something else, and commonly are. The table doesn't mention phase at all. It seems that bomb plutonium, presumably where much of it is, is stabilized in delta with a small amount of gallium. Gah4 (talk) 21:01, 28 September 2020 (UTC)

zeroth element neutronium
Cydh Since there have been periodic tables with an element with an atomic number of zero, neutronium, shouldn't that be worth a mention? _Nagelfar (talk) 02:46, 2 October 2020 (UTC)
 * It's not generally considered an element in the chemistry community. Double sharp (talk) 11:49, 2 October 2020 (UTC)


 * This is a list of elements 'by their atomic number' and there are extant referenced sources using an instance of a zeroth element that has some basis in science. Whether or not it's a standard scientific practice, in an article of this great of a specifity & and this particular, it should at least be noted that some, from a scientific standpoint, have noted the idea of a 0th element (containing only neutron) Nagelfar (talk) 15:34, 2 October 2020 (UTC)

Update List table
I have changed the List of elements into using dedicated table List of chemical elements (/doc)

The table is build with row-subtemplate for each element to ease handling input, formatting, changes. Some data is read from central data lists (such as standard atomic weight). Some repetitive footnotes, for example on full sets of elements, are removed. Basic numerical handling in formatting and sorting.
 * In short:


 * In detail:
 * Columns
 * Added columns block, origin, phase
 * Add separate parameter for symbol clarification (like "Hg")
 * Anchor by symbol added for cross-linking: #He (for example for the Ytterby brothers)


 * Data sources
 * Use standard-data from when available.
 * Per symbol: name, Z, group, period, block, s.a.w., origin, phase
 * Otherwise, data from old version was used initially
 * For: etymology, density, m.p., b.p., heat capacity, electonegativity, abundance
 * Etymology refined writing & punctuation, crosslinks added (e.g. between the four Yterbium-names)


 * Notation
 * Used "" when projected or estimated value
 * Format by
 * Sorting uses numerical value ( feature)


 * Footnotes
 * removed footnotes referencing uncertainty
 * removed footnotes that describe sets of elements
 * kept footnotes on singular exceptions (He, As, Pu)
 * repeat footnote from header at first live appearance (e.g., first actual [ ] notation)


 * Compare old/new version
 * List of chemical elements/2020


 * Technical:
 * use row-template, parameters
 * use val when "" value (needed for number handling)


 * Not done:
 * Check existing data by source
 * No mayor changes

-DePiep (talk) 13:11, 30 June 2021 (UTC)